Remote control mechanism



H. SCHRDER REMOTE` CONTROL MECHANISM March 22, 1938.

Filed Feb. 14, 1954 Mci/1759 R, RR

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Patented Mar. 22, 1938 UNITED STATES OFFICE REMOTE CONTROL MEOHANISMtion of Germany Application February 14, 1934, Serial No. 711,101 InGermany March 18, 1933 3 Claims.

The present invention relates to a control device for a signalingsystem, and especially to a remote control mechanism for radioapparatus.

If a part of an apparatus, say the tuning means of a radio set, is to becapable of being adjusted to two exactly defined positions, it is oftenfound that, especially where remote control is concerned, diculties willarise. Whenever, these two positions of the element to be controlledshall be adjusted in a different way, either the control handle or knobmust be actuated between different limits or else the gear ratio must bealtered. Still more diiiicult is the problem of joint control of severalelements which are inneed of adjustments ofV dissimilar size or amount.

Now, these .difficulties are obviated, according to the presentinvention, by having the operating handle directly, or by theintermediary of a suitable positively acting coupling or clutch, adjusta friction surface in both directions. which will entrain or drive thecontrolled element (say, the spindle of a variometer, condenser,feedback element, or the like) in both or either direction only as faras a pre-set stop, and as far as feasible in the absence of backlash orslip. The fixing or acljusting of the element to be controlledv in thetwo terminal positions in case of rotary motion is preferably insured byfurnishing the spindle of the said 4element with a crank which, or whosecrank pins, rock or move between two adjustable stops.

For a better understanding of the invention reference is made to theaccompanying drawing in which Fig. 1 is a perspective View of anembodiment of the invention as applied to a combined radio receiver andtransmitter;

Fig. 2 is a partial sectional View along line 2 2 of Figure 3 throughone of the tuning devices of Fig. 1 and Fig. 3 is a front View of thecontrol device of Fig. 2.

One embodiment of the basic idea of the invention is shown by way ofexample in the threeY through an angle of l80`degrees so lthat it willoccupy a position as indicated by the dotted line, or through some othersuitable angle, and returning of the said lever, is to set or adjustVarious Y parts of the equipment (for instance, the circuits of thepilot stage of the transmitter, the master stage of the same, theantenna and the coupler means thereof, furthermore the tuning circuitsof the receiver and its feedback' means) so that they will occupy twodefinite terminal positions corresponding to two distinct wavelengths.the two end or terminal positions may be different for differentelements to be subjected to control. Details of the drive can be seenfrom Figs. 2 and 3.

f Fig. 2 illustrates the control of a variometer whosev rotor r seatedupon the spindle e inside the stator S is adapted to be entrained by thedisk d. The said spindle e is journaled -either in a xed wall or in arigid frame n. The pressure required for the drive of the disk d,loosely seated upon the spindle e against the collar i of the saidspindle, is effected by the agency of a saddle spring f which isinserted between a crank g secured to the shaft and a washer y bearingagainst disk d. The disk d is subject to positive control from theremotecontrol lever a, and its maximum setting angle is larger than theprescribed adjustment angle a of the variometer between the two terminalpositions of the same.

For xing the twoterminal positions of the controlled element there isused a crank g se- Y 'cured on the spindle e and whose pin h is movablein the slot, or keyway, o of a fixed wall m l(which, if the crank is ofsuitable direction could also be identical with n) To limit thismovement in both directions according to the desired size of the angle athere are used adjustable stops k, lc (Fig. 3). When the crank pin abutsagainst one of these stops the spindle can no longer be entrained by thedisk d which continues moving.

All of the clutch disks d pertaining to the different spindles to becontrolled may be inter-connected by means of tooth-wheels or pulleydrives so that upon one of the disks d being moved by virtue of remotecontrol action, also the others will partake of this motion.. Y

What is claimed is:-

1. A drive mechanism for a rotor element of Ya radio set comprising anadjusting handle located at a position remote from said radio set, aspindle for supporting the rotor element, a pulley loosely mounted onand directly engaging said spindle, a spring arranged to hold saidpulley in frictional However, the setting angles a between engagementwith a portion of said spindle, a iiexible coupling means between thehandle and said pulley, a panel provided with an arcuate slot, a pair oflimiting stops disposed in said slot and separated by a desired angulardistance, a pin rigidly coupled to the end of said spindle and lyingparallel therewith, said pin being disposed within said slot formovement between said stops and the angle traversed by said pin beingsubstantially less than that through which said handle is adjusted.

2. A drive mechanism for a rotor element of a radio device comprisingthe combination of an adjusting handle located at a remote distance fromsaid radio device, a pulley connected to said handle, a spindle forsupporting the rotor element, an arm secured to the end of said spindle,a pin projecting from said arm, a second pulley loosely mounted on saidspindle between said arm and rotor element, a flexible belt engaging theperipheries of said pulleys, a compression spring engaging said arm andsecond pulley and arranged to hold said pulley in frictional engagementwith said spindle, and two spaced apart stops adapted to be engaged bysaid pin, the angle between said stops being less than the angle throughwhich said handle is adjusted to secure a predetermined adjustment ofsaid rotor element.

3. In combination, a radio device having a plurality of tunable elementseach adjustable through a different angle, a shaft secured to each ofsaid tunable elements, pulleys loosely mounted on said shafts and havingtheir peripheries in engagement, a friction clutch connecting each ofsaid shafts and pulleys, a crank arm secured to the end of each of saidshafts, a pin secured to each of said crank arms at right anglesthereto, a pair of stops engaged by each of said pins to limit theangular motion thereof, one of said pins being adjustable through agreater angle than the other and a flexible driving means connected toone of said pulleys.

HEINRICH SCHRDER.

